Microwave oven



FIG. 1 is a top, front, and right side perspective view of a microwave oven showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a right side elevation view thereof, the left side elevation view being a mirror image thereof;

FIG. 5 is a rear elevation view thereof; and,

FIG. 6 is a bottom plan view thereof. 

We claim the ornamental design for a microwave oven, as shown. 